Optical cystoscope system.



M. VON ROHR. OPTICAL GYSTOSCOPE SYSTEM.

APPLICATION FILED JULY 12. 1909.

Patented Nov. 23, 1909.

8 W W -z wt g N iiil$3i ,W, Y {7 m UNITED STATES PATENT OFFICE.

MORITZ voii BOHR, orJENA; GERMANY, assienon TO THE FIRM or CARL ZEISS, OF-

. JENA, GERMANY. I 1

OPTICAL CYSTOSCOPE SYSTEM.

To all whom it may concem:

Be it ,known that I, Mom'rz VON RoHR, a citizen of the ,German' Empire, and residing at' Garl-Zeiss strasse, Jena, in the' Grand Duchy of SaXe-W eimar, Germany, have invented a new and usefuloptical Uystoscope System, of which the following is a specifi- The invention relates to dptical systenis for-cystoscopic and like purposes.

The usual system for cystoscopes and'the -like comprises, in addition to an entrance rehectmgt prism, an-objective lens,-a collective lens near the place where a real image .ot' the object is produced by the objective lens, an inverting lens, and an ocular. The

diameter of a cystoscope is not allowed to exceed a certain very small value, whereas the length of. the instrument must reach a I comparatively large value. This peculiarity, together with the .low power of the little source of light provided in the instrument,

prevents the image presented to the observer from being so bright asthe mage yielded-by any other optical instrument.

the luminosity of the optical cystoscope sys tem without reducing its field of view. For

this purpose two or more inverting lenses are made use of instead ,of .the one hitherto employed, each of them having a shorter focal distance than that, single one, and in be understood, that the second inverting lens restores the position of the image produced by the objective lens. According to the invention the final image presented by the.

instrument with ,two inverting lenses is made erect by employing as entrance re flecting prism an inverting prism after amici, a so-called ridge prism/having two reflecting surfaces at, right angles to\each other..

1 In adapting the front;- lens system to the shortened ifocal'length of the first inverting lens, the first collective lens'may suitably be replaced by a combination of two collective I lenses. By this means the requirement of an increased collective effect is fulfilled with out prejudicing the quality ofithe image.

Specification of Letters Patent.

The obj ect' ,of the invention is 'to enhance The inverting lenses should be achromatic double lenses. i

. ln the accompanying drawing an optical system for cystosccpes according to'the invention is represented.

The first component of the system shown isan inverting ridge prism a.- On its exit sur face, which lies in the plane of the en-: trance pupil of the system, a diaphragm b is fixed, the entrance pupil thus becoming a,

physical one. The lenses are arranged in the following consecutive order: an objective lens 0, a combinat on oi two collective lenses d and e, an achromatic lnverting lens f, a.

third collective lens 9, another achromatic inverting lens 1;. and a Ram'sden ocular composed otthe field lens 71 and eye lens is.

The path of the rays is shown by means of 'ing from two lateral object points v0 .and- 0 Forthe sake of clearness the full pencils are behind the eye lens is. The principal rays 1 the system, forthe first time Within the entrance pnpil, in the center of the diaphra m b, hereafter in the inverting lens f, tliir ly in the inverting lens h, and finally in the exit pupil Z being the real imageiot' the en'- 1 trance pupil (diaphragmb) as produced by Patented Nov. 23, 11909. Application filed J 'uly 12,1909. Serial No. 501200;. I

the principal'rays l and 2 of the pencils issuonly indicated in, front of theprism a and I and 2 cro'sseach otheralways on'the axis of '85 the totality of the lenses. Three real" images again reproduced by the second invertingi the ocular. On account of the inverting property ofthe prism'a, the first image is anobserver through. the eye lens is is again erect.

I claim:

plurality of inverting lenses, ea'ch reproduclens it closely in front of the field lens '2' of' 1. A cystoscope system comprising an en-" trance reflecting system, an ob ective lens, a,

'inga real image of the object in another real image, a plurality of collective lenses and an ocular.

2. A cystoscope system comprising the.

/ type, an objective lens, a collective lens, near the place where the real image of the object following consecutive components: an entrance reflecting prism of the, inverting ridge erect one, so that the third image seen by the 2 I 940,89e' I produced'by the-objective lens, en invertproduced. by the objective lens, an achro-;

ing lens, another collective lens near the maticinverting. lens, a third collective lens lace where the second real image of the obnear the place where the. second real image? ect is produced by the inverting lens, anof the object is'producedby the invert' 15" 5 other inverting lens and an ocular. lens, another achromatic inverting lens on i A cystoscope system consisting of the "an ocular.

o owing. consecutive components: an entrance reflecting prism of the inverting ridge MORITZ ROHR' .type, :1 dm hragm, an ob ect1ve lens, a com- Witnesses: 10 bination 0 two collective lenses near the 7 PA L'KRfioER,

place where the real imageoi the object is Fm'rz SANDER. 

